:root {
  --green: green;
}
.demo {
  width: 200px;
  height: 200px;
  background: #FF0000 url("../images/mm.jpg") scroll no-repeat 0 0;
}
.test {
  display: flex;
  transform: rotateY(130deg);
  color: var(--green);
}
p {
  color: red;
}
